The Twelfth Doctor once claimed, when being attacked by a race of dragon-like beasts who were indigenous to a planet, that dragons were fictional. Lord Mortigan explained that the dragons had to have been genetically modified "a little" by the human colonists. They were inhibited and enslaved by the colonists' inhibitor chip, which the Dragon Lord had freed them from. The dragons subsequently killed the royal family as well as the Dragon Lord in the Red Castle. The dragons were left to roam the planet freely, after the Doctor contacted group of rescue ships to pick up the surviving humans. (COMIC: The Dragon Lord)

Dragons existed in the dreamrealm inhabited by Avalon. The Fair Folk used them to harass infantry and prevent UNIT's domination of the air through the use of jet fighters. The Eighth Doctor rode one deep into Fair Folk occupied territory in order to attempt to forge a ceasefire. (PROSE: The Shadows of Avalon)